Winkey+R and then

    powershell -Command "& {Invoke-WebRequest -Uri 'https://download.mozilla.org/?product=firefox-latest&os=win64&lang=en-US' -OutFile 'Firefox.exe'}"

Not saying it's ergonomic but since you asked ;-)

I mean ... I guess this works.

Edit: Actually now that I think about it I'm saving this to avoid using Edge myself in the future. Thank you!

-Command “& {thing}”

is the same as

-Command “thing”

Makes sense, sorry... I hate PowerShell tbh. I just googled/ChatGPT'd that!

Don't think they still have an FTP site, but I used the trick of opening ftp.mozilla.org in explorer to get an installer at least twice during the XP era. That said, I also used the MSN browser for fun sometimes, as well as web browsing in explorer.exe.

I guess I don’t mind using edge to install firefox or safari on os x. You got me.

Well, Safari doesn't have 10 dark-pattern popups it greets you with when you first use it, before you can even type an address into the address bar. Edge does.

Edge dark patterns can't do shit to me.

Not that Apple is a stranger to accosting you over browsers, though: https://discussions.apple.com/thread/252412228

winget Mozilla.Firefox

Is Firefox not in the Windows package manager?